And ferdinand



(No Model.) 2 Sheets-Sheet 1.

E. B. MEYROWITZ 8v F. BUCHHOP. ELECTRIC MOTOR.

No. 447,734. e Patented Mer. 3, 1891.

(No Model.) 2 Sheets-Sheet 2.

E. B. MEYROWITZ 8v I'. BUGHHOP. ELECTRIC MOTOR.

No. 447,734. Patented Mar. 3,1891.

Illll 5 jerdmzouchhop. W @13 wz'r @Hoz new UNITED STAT-ns PATENTCritics.

EMIL I3. MEYRO IITZ, OF RIDGEFIELD, NEV JERSEY, AND FERDINAND BUCHIIOP,OF KEW YORK, N. Y.;

MEYROYITZ.

SAID BFCIIIIOI ASSIGNOR TO SAID ELGTRlC MOTO R.

SPECIFICATION forming part of Letters Patent No. 447,734, dated March 3,1891.

Application filed May 24, 1890. Serial No. 353;()74. (No model.)

To @ZZ whom it may concern:

Be it known that we, EMIL I3. MEYROWITZ, of Ridgefield, in the State ofNew Jersey, and FERDINAND l'SUcnHor, of New York, in the State of NewYork, citizens of the United States, have jointly invented a new anduseful Improvement in Electric Motors, of which the following is aspecification.

This invention relates to portable electromagnetic motors for lightwork, such as that of surgeondentists; and the invention consists incertain novel combinations of peculiarl y constructed and arrangedparts, as hereinafter set forth and claimed.

rllhe objects oi' this invention are to adapt the working parts to beinclosed in a neat and substantially spherical casing or shell and tosimplify the construction of small motors.

Two sheets of drawings accompany this specification as part thereof.

Figure l of the drawings is a side View of our motor, showing itsexternal appearance. Fig. 2 is an elevation from the same point of Viewwith the casin g removed. Fig'. 3 is a top View of the parts shown inFig. 2, Fig. et represents an elevation of the armaturespindle and theparts carried thereby and a section through the surrounding parts in theplane represented at l 4:, Fig. 3.

Like letters of reference indicate corresponding parts in the severalgures.

The cores c, Fig. et, of a pair of suitablycurved field-magnets M M2 arerigidly coupled to and supported by a circular equatorial frame-platekP, the respective magnets projecting from the opposite sides of theplate at opposite edges, as shown in Fig. 2, and terminating inpole-pieces p, having concentric inner and outer surfaces and locateddiametrically opposite each other in a line oblique to the plane of theframe-plate.

The binding-posts I P2 are conveniently attached with interposed blocksof vulcanite to the periphery of the frame-plate P, and the coils of thefield-magnets are conveniently connected in series from the positivepost I by insulated wires il; and to?, as shown in Figs. 2 and Ll.

The armature A is preferably a Grammc .rin g ol:l small diameterrotating centrally bctwoen the poles ofthe field-magnets within anopening O, Fig. in the frame-plate, its several coils being connected incustomary manner with corresponding metallic sections of the commutatorC, as shown in Figs. 2 to 4. The peripheral contact-surface of thecommutator is preferably beveled or conical, as shown in Figs. 3 and 4,to coact with a pair of flat brushes I3 B2, which press against saidconical surface at diametrically-opposite points, being supported at theproper angles by suitably-beveled blocks of vulcanite interposed betweenthem and the respective sides of the frame-plate to which they are soattached. As compared with the employment of a cylindrical commutator,more certain. contacts are thus insured with reduced friction and with asaving of space, which is important in connection with the primaryobject of this invention.

The brush is connected by insulated wire w3 with the terminal of thecoils of the eldmagnets, and the brush B2 is connected by insulated wiretu* with the negative bindingpost Pi, as best seen in Fig. 2.

The armature-spindle S is fast within the armature and commutator andoccupies radial bearings b b2, Figs. 3 and d, formed in the frame-plateP at its perimeter in a line at right angles to the plane of thefield-magnets. Both ends of the spindle protrude and are providedrespectively with a motion-transmitting wheel W' and with an axialsocket s for coupling thereto a iiexible shaft, or to receive the tangof a suitable tool to be carried by the spindle. The bearing t), throughwhich the wheel end of the spindle projects, is provided with a simplebushing b, of suitable brass or bronze, held in place by a radial screw.The bushing b3 ot the bearing b2 is preferably combined with a nozzle nfor the attachment ot' the customary sheath for the flexible shaft whenthe latter is used, the two being united end to end by a screw-joint S2,which serves also to draw collars on the respective parts against theends ot the bearing h2, and thus to render the bushing tight. A loosewasher o; is interposed between a shoulder on the socket end of thespindle and the inner end of said bushing b3, to aid in.

IOC)

preventing wear due to endwise thrust of the spindle. The frame-plate Pconstitutes the usual magnetic connection between the cores of theheld-magnets M M2, and is consequently of iron. To facilitate millingout the opening 0 and assembling the parts, the frameplate isdiametrically divided in the plane of the held-magnets, as shown atj,Fig. 3, the parts being rigidly :reunited by the heels h of therespective magnet-cores @,which cross the plate-joint and are clampedfast by screws. The frame-plate is further provided at these points witha pair of fastening-pieces y, each of which is attached by a screw tothe opposite side of the plate as compared with the adjacent core-heelh, and the outer surfaces of the core-heels and fastening-pieces arelocated just within the circular edge of the plate and are curvedconcentrically t-herewith and with the field-magnet poles. The outersurface of the pole-piece p of the magnet M2 is also provided with ascrew-attached fastening-piece f2.

All the parts above described on the respective sides of the frame-plateP are inclosed within nearly hemispherical casing parts C C2, of anypreferred material7 corresponding in diameter' to the frame-plate attheir edges and attached by fastening-screws f to said core-heels 7L andfastening-pieces f. The outer surfaces of the casing parts are thusrendered flush with the peripheral surface of the frame-plate, and thecasing as a whole may form a true sphere.

A central openingin the upper casing part C admits the screw-stem of aring attachment R to a threaded vertical hole in said fastening-piecef2, and screwing home this ring attachment completes the structure.

The motor may be suspended by its ring or may rest in a tripod or othersuitable support or be held in the hands while in operation with equalfacility, and presents a neat and pleasing appearance, as indicated inFig. 1, which is a desideratum in a motor for surgeon-dentists and likeusers.

Details which have not been specified may be of any approveddescription, and We do no limit our respective claims to mechanical 5odetails, except as therein expressly stated.

2. In a spherical electric motor, an equatorial frame-plate havingbinding-posts attached, with interposed insulators, to its periphery, incombination with a pair of ieldmagnets having cores attached to saidplate within its perimeter and magnetically connected thereby, anarmature rotating between the poles of said magnets, amotion-transmitting spindle, and suitable electrical connections andaccessories, substantially as hereinbefore specied.

In a spherical electric motor, an equatorial frame-plate having asuitable opening therein, in combination with a pair of fieldmagnetshaving cores attached to said plate on its respective sides atdiametrically-opposite points and curved in one and the same circularline, a central armature rotating between the poles of said magnets, amotiontransmitting spindle, and suitable electrical connections andaccessories, substantially as hereinbefore specified.

4. In a spherical electric motor, the combination, with an equatorialframe-plate having a suitable opening therein, of a central rotaryarmature, an armature-spindle in the plane of the frame-plate, curvedeld-magnets 'attached to said plate and surrounding or partlysurrounding said armature, a conimutator carried by thearmature-spindle, insulated brushes carried by said plate, and suitableelectrical connections, substantially as hereinbet'ore specified.

5. In a spherical electric motor, the combination, with an equatorialframe-plate, of insulated binding-posts attached to its periphery,field-magnets attached to its respective sides and magneticallyconnected thereby, a central rotary armature, an armature-spindle in theplane of the plate, a commutator carried by the armature spindle,insulated brushes attached to the respective sides of the plate, andinsulated wires connecting the positive binding-post with the coils ofthe field-magnets in series, said coils with one of the brushes and theother brush with the negative binding-post, substantially ashereinbefore specified.

6. In a spherical electric motor, au equatorial frame-plate having asuitable centralopenin g and divided diametrically, in combination witha pair of field-magnets, the cores of Which have heelswhereby themagnets arev attached to the respective sides ot' the plate and theparts of the plate are united, an armature rotating Within said opening,a motion-transmitting spindle, and suitablev electrical connections andaccessories, substantially as hereinbefore specied.

EMIL B. MEYROVITZ. FERDINAND BUCHHOP.

In presence of- WM. H. WooDHULL, H. A. JANsING.

IIO

